import utils.*;

public class StringDemo {
	static public void main(String[] args){
		String string = "Have a nice day !!!:";
		Utils.println(string.toUpperCase());
		Utils.println(string.toLowerCase());
		Utils.println(string.length());
		Utils.println(string.replace("nice", "good"));
		Utils.println(string.substring(5));
	}
}
